Radial ply refers to a type of tire construction where the tire's layers, or plies, are arranged radially from the center of the tire. This means that the cords in the tire's structure run perpendicular to the direction of travel, providing better flexibility and improved contact with the road. This design enhances traction, stability, and fuel efficiency, making radial ply tires popular for various vehicles, including cars and trucks. Unlike bias ply tires, which have plies arranged at angles, radial ply tires offer a smoother ride and longer tread life. The construction allows for better heat dissipation, reducing the risk of blowouts. Overall, radial ply tires are a common choice for modern vehicles due to their performance benefits and durability.